MUSEUM OF COMPARATIVE ZOOLOGY 



29 



There are 352 milled divisions on edges of head-stocks for ad- 

 justing period of pendulums; and the crossbar carrying same has 

 two threads to 1 mm. The horizontal displacement of the upper 

 point of support for each turn of one division of milled edge of 

 head-stock thus equals 0.00284 cm. 



The geographical position of the Station as determined by 

 Professor Willson is L. 42° 22' 36" N., Long. 71° 6' 59" W. from 

 Greenwich. 



The orientation of the two components as determined from the 

 meridian carried into the instrument room bv Mr. Burke is as 



from Sept. 8, 1909, to July 29, 1910. 



TION OF 



DlSTV 



1+A=I 



LNCE 



3=A 



Range 





1st Pre- 



All Pre- 



Remarks 



liminaries 



liminaries 



V*— Vi 



Wi-Vi 







h. m. s. 



m. s. 



Miles 



Miles 



mm. 





8 26 



24 40 



4300 





8 



Began Washington 11:59:52. 



8 25 



22 45 



4300 





9 



Shocks reported in Amazon Valley. 

 Illegible. 



5 18 



10 08 



2300 



2100 



7 



No press reports. 



5 14 



10 06 



2200 



2100 



<N CO 



No press reports. 





7 56 





1642 



1 



3 

 1 

 5 



Waves in short group. Shocks reported in Idaho. 

 Time uncertain. 



11 09 



25 15 



6700 



5225 



Readings doubtful. 











4 



Undecipherable . 



A group of 3 waves ; 16.6s period. 



12.6s 

 Shocks on Pacific Coast at 1:45 a. m. 

 Illegible. 











18 



5: 29: 24 possibly =V 2 . 



E. W. component locked by damper. 



14 40 









1.5 

 3.0 



0.4 

 0.5 

 0.4 

 0.5 



Quake reported in Bimgo Channel, Japan, 

 about this time. 

 4 waves of ca. 15 sees, period. 

 E. W. record erased. 



Doubtful readings. Reported earlier at Ann 

 Arbor, Mich., Japan? 



Not reported. 2 A-l =Wi — V 2 =2050 mi. 

 Earthquake at Guam Id. 



12 00 



23 20 







3 





4 55 



8 57 



2050 



1800 



61 



Shock reported at Vicio Chico, Quintana 



4 42 



8 23 



2000 



2750 



111 



Roo, Mexico (Yucatan) and Swan Id. 



5 56 



11 08 



2700 



2500 



150 + 



Needle fell out near Max. Quake reported 



6 05 



11 44 



2750 



2800 



150 + 



at Seydisfiord, Iceland, 3:45 a. m. 



5 20 



9 15 



2300 



1914 



4 



14.7 

 .2 

 .75 



Quake reported at St. Vincent, W. I. I., at 

 2.50 p. m. 60° time. 











Distant 1750 mi.? 













Group of 2nd P. T. s with Wi at 8:32 a. m. and 













again at 4 p. m. 



